Hip Passive Motion Machine

Circumduction Device

Last year, approximately 30,000 individuals in the United States underwent surgery to repair a

torn acetabular labrum. The acetabular labrum is a ring of fibrocartilage that forms a ring

around the acetabulum of the pelvis. Acetabular labral tears are severe injuries that require

surgery to repair. Without surgery, patients are unable to return to their previous levels of

activity. There is a labor-intensive rehabilitation routine post-surgery, comprising several

interventions, which facilitates the healing process.


The focus of this project is to design  an assistive

device to provide passive hip circumduction. Circumduction is defined as moving

the joint in a circular motion. Passive motion means that the patient is not actively contracting

any muscles during the intervention. At present, a caregiver performs hip continuous passive motion daily

for two to four weeks, post-operative. This method to provide passive circumduction is physically demanding on the

caregiver and leaves the patient dependent on this person to expedite the healing process.



1.  Here is what one senior design group came up with elsewhere - However, there are numerous issues with this machine!!



2. A movie of the process is included here: http://www.coe.montana.edu/me/ME_MET_Capstone/Capstone%201%20Fall%202012/Project%20Descriptions/hipcircumduction.MOV


Sponsor: Dr. Laura Stanley and Great Northern Physical Therapy